SEGMENT REPORTING - Schedule of Reconciliation of Total Segments to Income Loss Attributable to Oaktree Capital Group, LLC and Total Assets (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Segment Reporting, Asset Reconciling Item [Line Items]
Equity-based compensation	$ 6,452	$ 12,189	[1]
Consolidated fund expenses	19,224	16,458
Non Operating Group Other Income		178
Ocgh Units Prior to Initial Public Offering in April 2012 [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Equity-based compensation	$ 5,800

[1] This adjustment adds back the effect of equity-based compensation charges related to unit grants made before the Company’s initial public offering, which is excluded from adjusted net income because it is a non-cash charge that does not affect the Company's financial position.